20H04 Datasheet, PDF (13/38 Pages) SMSC Corporation – 4-PORT USB2.0 HUB CONTROLLER

4-Port USB2.0 Controller
Datasheet
NAME
USBDP0
USBDM0
VBUSDET
USBDP1
USBDM1
VBUS1_N
OCS1_N
GR1_N
AM1_N
USBDP2
USBDM2
VBUS2_N
OCS2_N
GR2_N
AM2_N
USBDP3
USBDM3
VBUS3_N
OCS3_N
GR3_N
AM3_N
USBDP4
USBDM4
VBUS4_N
OCS4_N
GR4_N
AM4_N
Table 4.3 - USB I/O Signals
BUFFER
TYPE
IO-U
IO-U
IO8
IO-U
IO-U
O8
IPU
OD8
OD8
IO-U
IO-U
O8
IPU
OD8
OD8
IO-U
IO-U
O8
IPU
OD8
OD8
IO-U
IO-U
O8
IPU
OD8
OD8
ACTIVE
LEVEL
DESCRIPTION
N/A Upstream USB Positive Data Pin.
N/A Upstream USB Negative Data Pin.
N/A Detects state of upstream V_BUS power. When designing a detachable
hub, this pin must be connected to the V_BUS power pin of the USB port
that is upstream of the hub.
For self-powered applications with a permanently attached upstream
host, this pin must be connected to either 3.3V or 5.0V (typically
VDD3.3).
The USB20H04 monitors VBUSDET to determine when to assert the
internal D+ pull-up resistor (signaling a connect event). When using the
SRP feature, it is necessary to add a 100k ohm resistor from this pin to
VSS in order to properly dissipate the upstream V_BUS Pulse (pulsed with
an 8mA drive capability).
N/A USB Positive Data Pin to downstream port 1.
N/A USB Negative Data Pin to downstream port 1.
Low Enables power to downstream port 1.
Low Over-Current Sense input. Internal pull-up resistor to 3.3V.
Low Enables green indicator to downstream port 1.
Low Enables amber indicator to downstream port 1.
N/A USB Positive Data Pin to downstream port 2.
N/A USB Negative Data Pin to downstream port 2.
Low Enables power to downstream port 2.
Low Over-Current Sense input. Internal pull-up resistor to 3.3V.
Low Enables green indicator to downstream port 2.
Low Enables amber indicator to downstream port 2.
N/A USB Positive Data Pin to downstream port 3.
N/A USB Negative Data Pin to downstream port 3.
Low Enables power to downstream port 3.
Low Over-Current Sense input. Internal pull-up resistor to 3.3V.
Low Enables green indicator to downstream port 3.
Low Enables amber indicator to downstream port 3.
N/A USB Positive Data Pin to downstream port 4.
N/A USB Negative Data Pin to downstream port 4.
Low Enables power to downstream port 4.
Low Over-Current Sense input. Internal pull-up resistor to 3.3V.
Low Enables green indicator to downstream port 4.
Low Enables amber indicator to downstream port 4.
SMSC USB20H04
Page 13
DATASHEET
Revision 1.63 (10-14-04)